The U. S. Supreme Court has put a halt, at least temporarily, on plans to let Google’s (GOOG) video site stream coverage of the “Proposition 8″ trial, which kicked off today in a San Francisco courtroom.

U.S. District Judge Vaughn Walker was going to allow the trial to be covered, on a tape-delayed basis, on the world’s biggest video site.

The Supreme Court has granted a temporary order overturning Walker’s ruling to allow tape-delayed youtube videos to be uploaded to the site by Court staff.

The court didn’t explain its reasoning, according to the Los Angeles Times, but perhaps we’ll hear more down the road–the ruling is only supposed to remain in effect until Wednesday.

Prop. 8 trial Day 1: Live coverage from the courtroom

If you want up-to-date trial info, the San Jose Mercury News is covering the trial from the Court room, and you can read their updates here.